Circuit and method for phase error correction in a digital recei

Details Circuit and method for phase error correction in a digital recei Circuit and method for phase error correction in a digital recei

1991-08-12

1993-09-28

Kuntz, Curtis

Pulse or digital communications

Repeaters

Testing

375 81, 329307, H04L 2706

Patent

active

052492044

ABSTRACT:
A digital receiver, such as "C-QUAM" receiver (10), has phase error correction. In another form, a software program may be executed by a conventional digital signal processor to also implement phase error correction. A digital input signal is demodulated to form an in-phase and a quadrature component. The in-phase and quadrature components are processed by a digital envelope detector (24) to form a composite signal containing left and right audio channel information. The in-phase component and composite signal are both processed by a reciprocal cosine estimator (28) and a quadrature channel circuit (38) to provide a difference signal also containing left and right audio channel information. The difference signal is input to phase error correction circuitry (16, 22, 26) to estimate a phase error of the digital input signal. The estimated phase error is then used to correct an actual phase error of the digital input signal during demodulation.

REFERENCES:
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patent: 4689804 (1987-08-01), Srinivasagopalan et al.
patent: 4896336 (1990-01-01), Henely et al.
patent: 4926499 (1990-05-01), Kobayashi et al.
patent: 4942592 (1990-07-01), Leitch et al.
patent: 4947409 (1990-08-01), Raith et al.
patent: 5062123 (1991-10-01), Geile et al.
"Introduction to to Motorola C-Quam AM stereo System" published by Motorola, Inc. in 1985; pp. 1 through 11.

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